Abstract. The photometric standards for luminous intensity and luminous flux held at the Bureau International des Poids et Mesures (BIPM) consist of two groups of lamps. The values ascribed to these standards are derived from the mean values of the most recent international comparisons of national photometric standards. Following the recent key comparisons organized under the auspices of the Consultative Committee for Photometry and Radiometry (CCPR), CCPR-K3.a for luminous intensity and CCPR-K4 for luminous flux, the International Committee for Weights and Measures (CIPM) decided in 2001 that the values ascribed to the BIPM standards should be adjusted to bring them into agreement with the reference values of these comparisons.

Print publication: Issue 1 (February 2002)